Lollipop Storage Space is Running Out

[Jiehfeng]

I just got a Fiio X7 Mark II (DAP), it comes with Lollipop. I installed Spotify, Apple Music, Play Store, and Chrome after system updates.

After about 2 days, I get a storage space running out notification and apps cannot download anymore. The device has 64GB of internal memory, no SD Cards are inserted.

In the storage setting, under "Internal Memory", it says available only about 1.9GB, but 2MB remaining space. Under "NAND Flash", there is 55gb or something, with 54GB free space.

Something tells me the internal memory is divided into a tiny partition and everything is installed on the tiny partition. When I plug in the device to a PC, I get the full 55GB or so and the apps like Spotify are on it, in the Android folder. So far I only downloaded a small playlist, so it's about 1.9GB. So by that it seems spotify is in the 55GB area, yet it says full.

On ES File explorer, I can check some other folders when I go to "internal", but it doesn't seem like the apps are installed there.

This is very annoying and there's no fix on the internet. Just clickbait articles like "7 ways to fix storage running out" with useless solutions like clearing data and cache.

Thanks in advance, would really appreciate the help.

FIXED, EDIT:
Thought I'd give Kingroot a try, surprisingly worked. Then got App manager III and moved Spotify to the "SD Card" and now no issues. Well then.

 

[Joom]

This is a thing that budget phone developers would do. The internal storage is partitioned, sometimes very irrationally. They'll give a very small amount of space to /data (which is where apps are installed), and allocate a bunch to media storage. I had an LG Optimus Dynamic back in the day, and they only allocated 2 GB for apps, and gave the rest to photo storage. Yes, DCIM had its own partition. I had to mount the NAND and repartition it.

 

[Jiehfeng]

This is a thing that budget phone developers would do. The internal storage is partitioned, sometimes very irrationally. They'll give a very small amount of space to /data (which is where apps are installed), and allocate a bunch to media storage. I had an LG Optimus Dynamic back in the day, and they only allocated 2 GB for apps, and gave the rest to photo storage. Yes, DCIM had its own partition. I had to mount the NAND and repartition it.

Exactly. Repartition? How would I go about doing that? Currently the solution was to move every app I install to the NAND by using an app with root access, I managed to root using Kingroot, then replaced it with SuperSU as Kingroot is suspicious to say the least and takes over everything.

 

[Joom]

Exactly. Repartition? How would I go about doing that? Currently the solution was to move every app I install to the NAND by using an app with root access, I managed to root using Kingroot, then replaced it with SuperSU as Kingroot is suspicious to say the least and takes over everything.

I believe I had to unlock the bootloader. I remember using ADB to mount the NAND locally, and used fdisk to do it all. The guide for it was on AndroidArea51, but I have no idea if that board even exists anymore.